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Nano Research 2023, 16(10): 12281-12285 https://doi.org/10.1007/s12274-023-5901-x
Research Article | Issue | Published: 24 July 2023

Quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe2 nanodevices

Show Author's Information Ying Xing1,2,§( ),  Yiyu Liu1,§,  Pu Yang1,3,§,  Jun Ge2,  Longxin Pan4,  Junyan Wang1,  Shichao Qi2,  Yi Liu4( ),  Jian Wang2,5,6,7,8( )
State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum (Beijing), Beijing 102249, China
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
College of Chemistry, Beijing Normal University, Beijing 100875, China
Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
Hefei National Laboratory, Hefei 230088, China
Beijing Academy of Quantum Information Sciences, Beijing 100193, China
CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China

§ Ying Xing, Yiyu Liu, and Pu Yang contributed equally to this work.

Keywords:
transition metal dichalcogenides, quantum phase transition, quantum Griffiths singularity, electrical transport property, two-dimensional superconductor
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Nano device
Cite this article:
Xing Y, Liu Y, Yang P, et al. Quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe2 nanodevices. Nano Research, 2023, 16(10): 12281-12285. https://doi.org/10.1007/s12274-023-5901-x
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Abstract Full text Electronic supplementary material About this article

The layered transition metal dichalcogenides (TMDs) have raised considerable interest in the past decades for both fundamental physics and low-dimensional nanodevice applications. Recently, intriguing phenomena of Ising superconductivity and quantum metallic state have been reported in two-dimensional (2D) 4Ha-TaSe2 nanodevices. Here, we report the magnetic field induced superconductor–metal transition (SMT) in mechanical exfoliated 4Ha-TaSe2 nanodevices with thickness down to 2.5 nm. We observe the quantum Griffiths singularity (QGS) of SMT in thin 4Ha-TaSe2 nanodevices by performing ultralow temperature transport measurements and activated scaling analysis. With increasing the thickness of TaSe2 nanodevice to 10.6 nm, the signature of magnetoresistance crossing region can hardly be detected, revealing the thickness dependence of SMT. In this procedure, the disorder strength plays a dominant role. This work enriches the platform for studying QGS and may stimulate further investigations on the correlation between different novel quantum phenomena in the same 2D superconducting system.


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About this article

Quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe2 nanodevices

Show Author's information Ying Xing1,2,§( ), Yiyu Liu1,§, Pu Yang1,3,§, Jun Ge2, Longxin Pan4, Junyan Wang1, Shichao Qi2, Yi Liu4( ), Jian Wang2,5,6,7,8( )
State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum (Beijing), Beijing 102249, China
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
College of Chemistry, Beijing Normal University, Beijing 100875, China
Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
Hefei National Laboratory, Hefei 230088, China
Beijing Academy of Quantum Information Sciences, Beijing 100193, China
CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China

§ Ying Xing, Yiyu Liu, and Pu Yang contributed equally to this work.

Abstract

The layered transition metal dichalcogenides (TMDs) have raised considerable interest in the past decades for both fundamental physics and low-dimensional nanodevice applications. Recently, intriguing phenomena of Ising superconductivity and quantum metallic state have been reported in two-dimensional (2D) 4Ha-TaSe2 nanodevices. Here, we report the magnetic field induced superconductor–metal transition (SMT) in mechanical exfoliated 4Ha-TaSe2 nanodevices with thickness down to 2.5 nm. We observe the quantum Griffiths singularity (QGS) of SMT in thin 4Ha-TaSe2 nanodevices by performing ultralow temperature transport measurements and activated scaling analysis. With increasing the thickness of TaSe2 nanodevice to 10.6 nm, the signature of magnetoresistance crossing region can hardly be detected, revealing the thickness dependence of SMT. In this procedure, the disorder strength plays a dominant role. This work enriches the platform for studying QGS and may stimulate further investigations on the correlation between different novel quantum phenomena in the same 2D superconducting system.

Keywords: transition metal dichalcogenides, quantum phase transition, quantum Griffiths singularity, electrical transport property, two-dimensional superconductor

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Publication history
Copyright
Acknowledgements

Publication history

Received: 27 February 2023
Revised: 25 May 2023
Accepted: 07 June 2023
Published: 24 July 2023
Issue date: October 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

We greatly thank J. J. Yan and X. Lin for their assistance and support in the ultralow temperature transport measurements. We thank Z. J. Wang, Z. Y. Yang, J. W. Luo, P. F. Zhan, Z. H. Cui, and Y. L. Li for helpful discussions in revising the manuscript. This work was financially supported by the National Natural Science Foundation of China (Nos. 11888101, 11974430, and 12174442), the National Key R&D Program of China (Nos. 2018YFA0305600 and 2022YFA1403103), the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB28000000), the Innovation Program for Quantum Science and Technology (No. 2021ZD0302400), Young Elite Scientists Sponsorship Program by BAST (No. BYESS2023452), the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (No. 22XNKJ20).

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